Dynamic preview display method of electronic device and electronic device thereof

Abstract

A method for use in an electronic device, comprising: acquiring an image frame from an image sensor; adjusting an output timing of the image frame based on a vertical synchronization signal of a display; and displaying the image frame on the display in accordance with the output timing.

What is claimed is: 
     
       1. A method for use in an electronic device, comprising:
 storing, in a memory of the electronic device, an image frame obtained via an image sensor based on a vertical synchronization signal of the image sensor; 
 determining whether a predetermined time has elapsed after a first vertical synchronization signal of a display corresponding to the image frame is generated; 
 in response to determining that the predetermined time has elapsed after the first vertical synchronization signal is generated, identifying the image frame from the memory; and 
 displaying the image frame on the display. 
 
     
     
       2. The method of  claim 1  wherein the image frame is displayed in a period between two subsequent vertical synchronization signals of the display. 
     
     
       3. The method of  claim 1 , further comprising displaying the image frame when the predetermined time has elapsed after a second vertical synchronization signal is generated without storing an additional image. 
     
     
       4. The method of  claim 1 , further comprising:
 determining whether an additional image is stored before the predetermined time has elapsed; 
 in response to determining that the additional image is stored before the predetermined time has elapsed, deleting the image frame without displaying the image frame; and 
 when the predetermined time has elapsed, displaying the additional image on the display. 
 
     
     
       5. The method of  claim 1 , wherein, when the electronic device operates in a preview mode, updating information associated with the first vertical synchronization signal. 
     
     
       6. The method of  claim 5 , wherein:
 the information includes an indication of at least one of a time and a period at which the first vertical synchronization signal is generated, and 
 the information is acquired from a driver of the display. 
 
     
     
       7. The method of  claim 1 , wherein a frame rate of the display is equal to or greater than a specified rate. 
     
     
       8. The method of  claim 7 , wherein the frame rate is sixty frames per second. 
     
     
       9. The method of  claim 1 , further comprising:
 storing an additional image frame after the predetermined time has elapsed; 
 when a second vertical synchronization signal of the display is generated, determining whether the predetermined time has elapsed after the second vertical synchronization signal is generated; and 
 in response to determining that the predetermined time has elapsed after the second vertical synchronization signal is generated, displaying the additional image frame on the display. 
 
     
     
       10. An electronic device comprising:
 a memory; 
 an image sensor; 
 a display; and 
 at least one processor operatively coupled to the memory, configured to: 
 store, in the memory, an image frame obtained through the image sensor based on a vertical synchronization signal of the image sensor; 
 determine whether a predetermined time has elapsed after a first vertical synchronization signal of the display corresponding to the image frame is generated; 
 in response to determining that the predetermined time has elapsed after the first vertical synchronization signal is generated, identify the image frame from the memory; and 
 control the display to the image frame on the display. 
 
     
     
       11. The electronic device of  claim 10 , wherein the image frame is displayed in a period between two subsequent vertical synchronization signals of the display. 
     
     
       12. The electronic device of  claim 10 , wherein
 the at least one processor is further configured to display, via the display, the image frame when the predetermined time has elapsed after a second vertical synchronization signal is generated without storing an additional image. 
 
     
     
       13. The electronic device of  claim 10 , wherein the at least one processor is further configured to:
 determine whether an additional image is stored before the predetermined time has elapsed; 
 in response to determining that the additional image is stored before the predetermined time has elapsed, delete the image frame from the memory without displaying the image frame; and 
 when the predetermined time has elapsed, display the additional image. 
 
     
     
       14. The electronic device of  claim 10 , wherein, when the electronic device operates in a preview mode, the at least one processor is further configured to update information associated with the first vertical synchronization signal. 
     
     
       15. The electronic device of  claim 14 , wherein:
 the information includes an indication of at least one of a time and a period at which the first vertical synchronization signal is generated, and 
 the information is acquired from a driver of the display. 
 
     
     
       16. The electronic device of  claim 10 , wherein a frame rate of the display is equal to or greater than a specified rate. 
     
     
       17. The electronic device of  claim 10 , wherein the at least one processor is further configured to:
 store an additional image frame after the predetermined time has elapsed; 
 when a second vertical synchronization signal of the display is generated, determine whether the predetermined time has elapsed after the second vertical synchronization signal is generated; and 
 in response to determining that the predetermined time has elapsed after the second vertical synchronization signal is generated, display the additional image frame on the display. 
 
     
     
       18. A non-transitory computer readable medium storing one or more processor-executable instructions, which when executed by at least one processor, cause the at least one processor to perform a process comprising the steps of:
 storing, in a memory coupled to the one or more processor, an image frame obtained via an image sensor based on a vertical synchronization signal of the image sensor; 
 determining whether a predetermined time has elapsed after a vertical synchronization signal of a display corresponding to the image frame is generated; 
 in response to determining that the predetermined time has elapsed after the vertical synchronization signal is generated, identifying the image frame from the memory; and 
 displaying the image frame on the display.